[xubuntu] computer going to sleep

[Tom Sparks]

I am trying to erase the hard drive and install xubuntu 10.04
I boot into the liveCD

when I select the xfce menu the system goes to sleep
or
when installing, I get to "ready to install" screen, click next/install, then system goes to sleep


I dont know how to debug this issue?
 

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tom_a_sparks "It's a nerdy thing I like to do"
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3 x (x)Ubuntu 10.04, Amiga A1200 WB 3.1, UAE AF 2006 Premium Edition, AF 2012 Plus Edition, Sam440 AOS 4.1.2, Roland DXY-1300 pen plotter, Cutok DC330 cutter/pen plotter
Wanted: RiscOS system, GEOS system (C64/C128), Atari ST, Apple Macintosh (6502/68k/PPC only)